The utility model relates to the technical field of bridge construction, in particular to a truss capable of being quickly assembled and erected, which comprises a right main body, a main rotating shaft is attached to one side of a main rotating block, a rotating frame is mounted on one side of the main rotating shaft, a main sliding block is arranged on the other side of the right main body, and one side of the main sliding block is connected with a main inserting block. An inserting hole is formed in one side of the main inserting block, a left main body is arranged on one side of the rotating frame, a main inserting groove is formed in the bottom of the left main body, an auxiliary inserting groove is formed in one end of the main rotating block, an auxiliary rotating shaft is attached to one side of the auxiliary rotating block, a supporting frame is installed on one side of the auxiliary rotating shaft, and an auxiliary sliding block is arranged on one side of the supporting frame; a pull rod is attached to the inner wall of the fixed shell, a telescopic spring is attached to one side of the pull rod, the truss is quickly spliced through the improved truss, the main inserting block and the fixed shell are additionally arranged, the main rotating shaft and the supporting frame are additionally arranged, and storage and transportation of the truss are facilitated.